Tyrannosaurus FX: What dinosaurs really sounded like
Twenty Thousand Hertz
Birds and Reptiles Share Closed-Mouth Vocalizations
Birds and reptiles share a common vocal behavior called a closed-mouth vocalization. Male ostriches have this boom call, in which the mouth is closed. Crocodilians can make very loud sounds that to us would sound most like a roar. The birds we have now are sometimes called living dinosaurs.
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